MLA

Eliot, George, 1819-1880. Letter, Friday, to Mr. Bray. Box 1. [1852 Jan 30]. https://collections.library.yale.edu/catalog/32366127.

APA, 6th edition

Eliot, George, 1819-1880. (["Box 1"])([1852 Jan 30])[Letter, Friday, to Mr. Bray]. https://collections.library.yale.edu/catalog/32366127.